Can't think of many right this second, but I'll edit this later.
007 Golden Eye - Remote Mines (for when you placed 20 and watched your friend walk into a ball of fire that lagged the hell outa the 64)
Galaxies - Flame Thrower (Killed my old computer but it was fun to watch)
Naruto: Gekitou Ninja Taisen 2 - Hakke Rokujuyon Sho (Just a friggin cool move)
MxO - Dual Pistol Execution
CoV - Build Up + Assassin Strike (Takes out tons of people who don't wear SOs, has to be with claws though, claws were awesome)